Chair



H., A. ATWOOD.

CHAIR.

APFLlCATlON FILED MAR-13,1920.

Patented July 13, 1920.

2 SHEETSFSHEET 1.

H. A. A-TWOOD.

CHAIR,

APPLICATIOH FILED MAR, 1 31 1920.

2 $HEETS-SHEIET 2.

PATENT OFFICE.

HARRY A. .A'IWOOD, 0F MILWAUKEE, WISCONSIN.

CHAIR.

Application filed March 13, 1920.

To (all 107L011 it may concern Be it known that I, HARRY A. Arwoon, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of W'isconsimhave invented new and useful Improvements in Chairs, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The present invention relates to certain new and useful improvements in chairs in general, but refers more particularly to features of novelty and advantage in swivel chairs with tiltable seats.

I Heretofore, in chairs of this type, the spring or springs employed to normally yieldingly urge the chair bottom to substantially horizontal position have been so arranged that the pull thereon is direct, and one object of this invention is to provide an improved construction whereby aleverage action upon the spring or springs is produced.

Another object of the present invention is to provide a chair of the type described employing a leverage spring arrangement in which the springs are inclosed by the chair irons. and in which the spring tensioning rod has one end in pivotal connection with the lower chair iron section or supporting member. a

A further object of this invention is to provide an adjustment for the spring cushionby means of a handle or nut in such a position that it may be operated by aperson while seated in the chair. a

A still further object of my invention resides in the means for securing the cushioning springs in position. Besides the accomplishment of these and other purposes, other salient features of the invention are simplicity in structure, economy in manufacture, accessibility of adjustable parts and a construction of pleasing appearance.

With the above and other objects in view which will appear as the description proceeds, my invention resides in thenovel construction, combination and arrangement. of

parts, substantially as hereinafter described and more particularlywdefined by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings I have illustrated one complete example of. the

Specification of Letters Patent.

the front stop member.

Patented J uly 13, 1920.

Serial No. 365.455.

physical embodiment of my invention, constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a side elevation of a chair embodying the features of my invention, a portion of the back thereof and the supporting legsbeing broken away.

F 1g. is a sectional view taken through the chair on the plane indicated by the line 2-2, of Fig. 5.

b Fig. 3 is a perspective view of the forward stop so constructed as to impart to the spring tensioning rod a rocking or pivotal connection' with the lower chair iron orsupporting member. i

Fig. 4: is a perspective'view of the collar member provided with lugs engageable with Fig. 5 is a bottom plan view of the under side of the chair seat and irons, parts being broken away tomore clearly illustrate structural details. j Fig.6 is a view, part in section and part in elevation, looking at the front of the chair 1rons,the springs being removed and said view being taken on. the line 66 of Fig. 5. v F 1g. 7 is a fragmentary view, part in section and part in elevation, taken through the inner ends of the cushion springs on the line 7- of Fig, 2, and

Fig. 8 is a perspective view of the member forengagmg the outer end of each cushion spring.

, Referring now more particularly to the accompanying drawings it will be perceived that the improved chair comprises a suitable supporting base composed of a plurality of legs 10, an adjustable threaded vertical post or shaft 11, the position of which may be regulated by an adjusting nut 12, a seat frame or supporting iron having diverging forwardly extending arms 13 fastened to the bottom of seat 14 and a pair of shorter diverged rearwardly extending arms 15 likewise secured to the under face of the seat, and a lower chair iron or supporting member 16 secured on the top of the post and having a pivotal connection with the supporting iron or seat frame as-will be later described.

The seat supporting spider arms are con-. nected together beneath the middle of the chair by side web members 18 and transverse web members 25 and 25' to form a rectangularopening 17 providing spring receiving compartment within which the formed with depending arms or ears 19 having their lower ends pivotally secured, by means of a pivot pin 20, to smaller upstanding cars 21 whereby the seat frame and seat are tiltably supported from the lower chalr iron 16. H V

' The iron 16 has a forwardly extending arm 22 providedwith an upstanding projection 23 upon the top of which is secured a bumper 24 for engagement with the. forward transverse rib 25 when the seat is in its'normal horizontal position. The rearward tilting movement of the seat is limited by two spaced upstanding projections 26 formed on the rear end of the iron 16 and provided with bumpers 27 engageable with projecting lugs 28 formed on the side webs 18, adjacent the rear transverse web 25. The chair is at all times yieldingly urged to normal position, with the'web 25 engagi'ngbiimper 24, by spring means concealed within the recess 17 between the lower iron and' the chair. bottom,'to be later described. 1 T

The forward projection 23 hasa vertically extending elongated aperture 29 therein through'which passes the'outer threaded end 30 of a tension adjusting bolt 31 having a cross head member 32 secured on'its inner end and engaging the inner ends or a pair of cushion springs 33, the outer ends of which are engaged with collar'members 34 carried by guide rods 35 (see Figs. '2 and 5). The springs 33 are coiled about the rods 35 which have their outer threaded en'ds engaged by nuts 36 and their inner ends passed through apertures 37 in the cross head 32, the inner ends of said guard rods being formed with eyes 38, engageable over inwardly projecting studs 39 formed integral with the side ,webs 18 rear-wardly of the pivot20; -Each stud 39 is formedwith an upstanding rib 40 to prevent the accidental disengagement therefrom of the eye .38 secured thereto.

3 The collar members 34 are formed with squared-recesses 41 in their outer faces in which the nuts 36 are sea-ted and thus held against accidental disengagement fromthe guidefrods 33, as will beobvious. As'best "shown in Figs. 2,3 and 6, the upper outer face of the projection 23 is projected' outwardlyas at'42 to'provide acurved surface 43 midway of the elongated aperture 29 to afford a pivotal or rocking connection between' the tension rod31and the iron 16.

Freely engagedwith the outer'end' of the tension rod 31-is a member 44, having two spaced apart" diametrically opposed curved menttherewith by means of a nut or hand 7 wheel 46 in threaded engagement with the end 30-01 the tension bolt to maintain the springs 33 in tension as will be obvious.

" From this construction it will be readily apparent that I provide a rocking or pivotal connection between the tension rod and the iron 16, and that aleverage action 'is "applied to the springs 33, as the opposite ends of the springs move simultaneously toward each other when the seat is tilted from its normal horizontal position, by reason of the tension bolt 31 having one end connectible with the inner ends of the springs and its other'end connectible with the chair iron 16, and the guide rods 35 having their outerends connected with the outer ends of the springs and'their inner ends connected withthe upper chair iron.

It will also be apparent that'the springs 33 are completely inclosed between the iron 16 and the seat bottom and thus make it possible to provide a very neatly finished chair. The studs 39 and the guide rod eyes 38 also provide an extremely cheap but efficientmanner of connecting the springs with the upper chair iron or seat frame. I

What I claim as my invention is:

1. A chair comprising asupporting member, a tiltable iron, means pivotally connecting the tiltable iron with said member, and means for yieldingly restraining the tiltable iron from movement and including a contractile spring, a stud integral with said tiltable iron to one side of its pivotalconnection with the supporting member, a guide having an end engaging one termination of the spring and its other end provided with an eye pivotally engaged with said stud, and means connecting the other end of adjacent end of the spring, means pivotally" connectingthe other end of said rod with the supporting iron to one. side of itsconnection with the supportingmember, a plate slidably mounted on the guide rod and engaging'the other end of said spring, and a tension rod having. one end connected with the plate member and its other end connected with the supporting member to the side of its connection with the supporting iron opposite to the connection of the guide rod :with the supporting iron; r 7

:3. A'chair comprising a supporting mem-- ber, a'tiltable chair bottomsuppo rting iron,

' a pair of spaced depending ears carried by said supporting iron, a pair of spaced'upstanding earscarried by the suporting member, a pivot pin connecting the depending and upstanding ears cto tiltably connect. the

supporting iron with the supporting memher, a cushion spring, a guide rod passed through the spring and having means fixed on one end and engaging the adjacent outer end of the spring and means on the other end of the guide rod in pivotal engagement with the supporting iron rearwardly of the pivot, a plate member slidably mounted on the guide rod and engaging the inner end of the spring, and a tension rod having one end connected with the plate member and its other end connected with the supporting member forwardly of the pivot.

e. A chair comprising a supporting member, a tiltable chair bottom supporting iron carried by the supporting member, and cushion means yieldingly withholding the supporting iron from tilting movement and including a guide rod having a retaining washer on one end and an eye on its other end, means connecting the eye with the supporting iron to one side of its pivot, a plate member slidably mounted on said guide rod, a cushion spring mounted on the guide rod between the retaining washer and the plate member, and a tension rod connecting the platemember with the supporting member, whereby a tilting movement of the supporting iron will move the opposite ends of the guide rod and tensionirod toward each other to compress the cushion spring between said washer and plate member.

In testimony whereof, I affix m signature.

HARRY A. A WOOD. 

